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Losing weight, bulking, or cutting? Complete guide to calories and nutrition

Afvallen, bulken of cutten? Complete gids over calorieën en voeding - Allin1Nutrition

Losing weight, bulking and cutting sound like three completely different goals, but under the hood they all revolve around the same single button: your energy balance. How many calories go in per day versus how many your body burns. In this guide we explain calmly and without hype how that works, how to calculate your calorie needs, what macros are, how to build a realistic nutrition plan and where supplements do and do not come in handy. No miracle cures, no crash diets — just a clear framework you can use for years to come.

This guide is written for beginners as well as those who have been training for a while and want to see the puzzle pieces fall into place. Feel free to take your time; you can also read it bit by bit and return to the section that is relevant to you at that moment.

In this guide

What it really comes down to: energy balance

There is no magic diet. No single eating pattern — keto, low-carb, intermittent fasting, paleo, you name it — has a secret ingredient that bypasses the laws of nature. What they all have in common when they work is that they somehow bring you to the right energy balance for your goal.

That energy balance is simple to understand: your body gets energy in through food and drink, and it uses energy to live and move. If you are on average below your expenditure, you will lose weight over time. If you are above it, you will gain weight. If you stay around it, you will maintain your weight. All the other details — timing, meal frequency, which foods — can help you stick to it and feel good, but they do not change that fundamental law.

That is why we like to keep it honest and practical at Alln1Nutrition. We sell supplements, but we are not going to fool you into thinking that a powder makes your results. Your results come from your nutrition, your training, your sleep and above all: what you stick to months after each other. The rest is secondary and supports the foundation.

What are calories?

A calorie is simply a unit of energy. On labels in Europe, energy is usually stated in kilocalories (kcal) and kilojoules (kJ). When someone talks about “calories” in the context of nutrition, they almost always mean kilocalories. Everything you eat and drink provides a certain amount of energy: proteins and carbohydrates approximately 4 kcal per gram, fats approximately 9 kcal per gram and alcohol about 7 kcal per gram.

Why is that important? Because your body needs that energy to function and because a surplus or deficit over a longer period determines whether you gain or lose weight. You use energy for four major categories:

  • Basic functions (resting metabolism): breathing, your heart, your brain, your organs, maintaining your body temperature. This is by far the largest category for most people, even if you do nothing all day.
  • Daily movement: everything outside your conscious training — walking, taking the stairs, shopping, cleaning, fidgeting. This is often underestimated and makes a big difference between people.
  • Training: your conscious sports and strength training. Important, but usually a smaller category than people think.
  • Digestion: your body even uses energy to process food. Protein costs the most here.

You do not need to know those categories by heart. The point is: your expenditure is more than just your workout, and it varies from person to person and even from day to day.

Calculating your calorie needs

Your maintenance calories are the number of calories at which your weight stays approximately stable: what goes in matches what you use. This number is your starting point for every goal. If you want to lose weight, you eat a bit below it. If you want to gain weight, you eat a bit above it. If you want to maintain your weight, you stay on it.

You do not need to calculate this by hand. We have created a free tool for this that gives a realistic estimate based on your height, weight, age and activity.

First calculate your calorie needs with our free calculator → Calculate calorie needs. This is the logical first step before you start losing weight, cutting or bulking.

Important to realize: such a calculator gives a starting point, not an absolute truth. Formulas work with averages, and you are not an average. Your real expenditure depends on your muscle mass, your daily movement, your sleep, stress and even the day of the week. So use the calculated number as a hypothesis, not as a final judgment. You eat according to it for one to two weeks, you monitor what your weight does, and you adjust. This way, an estimate on paper gradually turns into a number that really fits you.

Losing weight: eating in a calorie deficit

Losing weight means structurally getting a little less energy in than you use. We call that a calorie deficit. Your body makes up the difference from your reserves, and over the weeks you see that reflected on the scale and in the mirror.

A realistic deficit for most people is around 15 to 25% below your maintenance, or roughly 300 to 600 kcal per day. This may feel slow, but slow is exactly the point here: a moderate deficit is easier to stick to, leaves more room for sufficient protein and muscle maintenance, and is less often accompanied by extreme hunger, lethargy and yo-yo behavior.

So be careful with crash diets. Eating very little gives a quick drop on the scale in the short term (often partly water), but it is almost impossible to sustain for long, it makes you listless and it nibbles at your muscle mass. For the sake of clarity: this is not medical advice and if you have health complaints, medication or doubts, consult your GP or a dietitian.

Four things make losing weight more pleasant and sustainable:

  • Enough protein. In a deficit, protein helps maintain muscle mass and keeps you full longer. Especially when you eat less, protein is the macro you do not want to let drop.
  • Strength training. Continuing to train gives your body a reason to hold onto muscle mass while you lose fat. Without stimulus, muscle is more often lost along with it.
  • Steps and daily movement. Your expenditure during the day adds up. Walking more is one of the easiest ways to support your deficit without starving yourself.
  • Sleep and consistency. Good nights make hunger and choices easier to manage. And a moderate plan that you stick to for months beats a strict plan that you give up after two weeks.

Cutting: losing fat, maintaining muscle

Cutting is essentially also losing weight — you are in a calorie deficit — but with a specific goal: lose as much fat as possible while maintaining as much muscle mass as possible. Where “just losing weight” often simply goes about a lower number on the scale, cutting revolves around the composition of that weight loss. You want what you lose to mainly be fat, not your built-up muscles.

That is why you approach a cut a bit more carefully than an undirected diet:

  • Do not drop too aggressively. A moderate deficit protects your muscle mass better than an extremely low calorie count. Faster is rarely better here.
  • Keep protein high. Sufficient protein is even more important in a cut than in regular weight loss, precisely because muscle maintenance is the goal.
  • Keep strength training and monitor your performance. Try to hold onto the weights and repetitions you can handle as much as possible. As long as you stay strong in the gym, you give your body a strong reason to maintain muscle.
  • Monitor progression, do not force it. In a deficit you usually do not get much stronger; the goal is maintenance. If you notice that your performance drops sharply, you are often cutting too fast or eating too little protein.

Cutting is therefore especially useful for people who already train or who have previously built up muscle mass and now want to get leaner without throwing away hard work. Are you completely at the beginning and just want to lose some weight? Then “losing weight” with enough protein and strength training is actually already a nice cut in miniature.

Bulking: controlled building

Bulking is the opposite: you structurally eat a little more than you use — a calorie surplus — to give your body the building blocks and energy to build muscle mass and strength. The surplus supports your recovery and your training; the muscle growth itself comes from that training and time, not from the food alone.

There is often a distinction made between two styles:

  • Lean bulk: a controlled, modest surplus (roughly 5 to 15% above maintenance, often around 200 to 400 kcal). You gain weight more slowly, but a larger part of that is muscle and you put on less fat. That makes a later cut shorter and easier.
  • Dirty bulk: eating well above maintenance without much structure. You gain weight faster, but a larger part is fat, and that has to be lost later.

For most people, a lean bulk is the wiser choice. Gaining weight faster is not automatically better: above a certain point you do not build more muscle, you simply put on more fat. Your body can only build muscle at a certain pace, and you cannot force that pace with an extra plate after an extra plate.

What does support muscle building during a bulk:

  • Progressive overload: doing more over time — more weight, more repetitions or better execution. This is the engine of muscle growth.
  • Enough protein as a building block for recovery, and carbohydrates as fuel for your heavier training sessions.
  • Recovery and sleep. You do not grow during the training but in the hours and nights after. Without recovery, progression is slow.

Maintenance: maintaining your weight

Not everyone needs to always lose weight or bulk. In a maintenance phase you eat approximately at your maintenance calories: your weight stays stable, and your focus shifts to getting stronger, feeling better and sticking to a routine that works.

Maintenance is for example very useful after a cut. Instead of immediately shooting off in all directions again, you give your body and your head a rest: your weight stabilizes, your energy returns, your eating habits settle. This way you turn a temporary diet into a livable baseline, and that reduces the chance of the classic yo-yo return.

Maintenance is also a great place to just stay for a while. You can stay there for months and still make progress in the gym, have more energy and get your routine on point. Constant progression on every front at the same time is not necessary; sometimes stability is exactly what helps you further. Think of weight stability, better performance, more energy and a rhythm that you stick to without much effort.

Counting calories: how do you approach it?

Counting calories sounds intimidating, but it is above all a way to create awareness. Many people underestimate or overestimate how much they eat; measuring for a moment opens your eyes. This is how you do it practically:

  • Use an app. There are free apps in which you scan or look up food. They calculate the calories and macros for you as soon as you enter your portions.
  • Weigh with a kitchen scale. Especially in the beginning, weighing is more accurate than estimating. A “scoop” of oatmeal or “a dash” of oil adds up faster than you think. After a while you will naturally get a feel for portions.
  • Learn to read labels. Look at the energy per 100 g and per portion, and at the proteins, carbohydrates and fats. This way you quickly see where the calories come from.

If you want to specifically learn to decipher supplement labels — what do all those small letters on a jar mean? — then read our article How do you read a supplement label?

Two nuances finally. First: counting calories is above all temporarily useful. Measuring for a few weeks teaches you a lot about your own portions, and after that you can often continue based on experience and feeling without continuing to record everything. Second: it does not have to become obsessive. If measuring causes stress or skews your relationship with food, that is a sign to start counting more loosely or to stop. It is a tool, not a lifestyle in itself.

Macros: proteins, carbohydrates and fats

Calories tell you how much energy you get in; macros tell you what that energy consists of. The three macronutrients are proteins, carbohydrates and fats. Each plays its own role.

Proteins

Protein is the building block your body uses for recovery and the maintenance of muscle mass — important for every goal, and extra important in a calorie deficit. Sufficient protein also often keeps you full longer, which is handy if you want to lose weight. A commonly used guideline for active people is around 1.6 to 2.2 grams of protein per kilogram of body weight per day; see that as a general starting point, not a strict law, and adjust it to what works for you. Good sources: lean meat, poultry, fish, eggs, dairy (such as lean quark, skyr and Greek yogurt), and plant-based options such as legumes, tofu and tempeh.

Carbohydrates

Carbohydrates are for your body a readily accessible energy source — fuel for your training sessions and for your daily functioning, from your concentration at work to your evening walk. They sometimes have a bad reputation, but you do not need to fear them; they fit perfectly into every goal, as long as your total calories are correct. Good sources: rice, potatoes, pasta, oatmeal, bread, and besides that fruit and vegetables that also provide fiber and micronutrients.

Fats

Fats are an important part of your nutrition and certainly belong there; they provide energy and are necessary for all kinds of processes in your body. They are indeed energy-dense (approximately 9 kcal per gram), so a dash of oil adds up faster than you would think — good to know if you are paying attention to your calories. Good sources: olive oil, nuts and peanut butter, seeds, avocado, fatty fish and eggs.

A practical order for most people: first determine your calories for your goal, then set your protein at a solid level, and distribute the rest of your calories over carbohydrates and fats according to your own preference. Do you like more carbohydrates around your training? Great. Do you prefer to be a bit higher in fats? Also good. As long as your total calories and your protein are correct, that distribution is above all a matter of what you find tasty and sustainable.

Does “the perfect diet” exist?

Honest answer: no. “The perfect diet” does not exist as one universal plan that is ideal for everyone. The best diet is the one that fits your goal, taste, budget, schedule, family, work and training rhythm — and that you stick to months after each other. A plan that is perfect on paper that you hate, loses to a “good enough” plan that you follow with pleasure.

A handy framework is the 80/20 rule: aim for about 80% of your nutrition to come from whole, minimally processed products, and feel free to leave 20% room for the things that make life fun — a piece of cake, a pizza night, a terrace. That flexibility is not a weakness, it is precisely what makes a plan livable. Pursuing perfection often leads to all-or-nothing thinking; flexibility leads to sticking to it.

With “whole foods” we mean the basic products on which you can build a large part of your meals: lean meat, poultry, fish and eggs; dairy; rice, potatoes, pasta and oatmeal; plenty of vegetables and fruit; legumes; and healthy fats such as nuts and olive oil. Such products provide a lot of nutrients per calorie, keep you full and make it easier to achieve your goal without suffering hunger. Add the 20% “for the fun” to that, and you have a pattern that works and stays fun.

Where do supplements fit in?

Now the most important about supplements: they do not replace the foundation. Your nutrition, training and sleep do the work. Supplements can at most be handy to make your plan a bit easier or more practical — nothing more, nothing less. Someone whose foundation is not in order does not solve that with a powder.

With that realistic expectation in mind, this is where the well-known supplements can fit:

  • Whey / protein powder. Can be practical to make your protein intake easier to reach, for example on busy days or right after your training if a full meal is not possible for a moment. It is in fact a quick, handy protein source. Check out our Whey Protein.
  • Creatine. One of the most researched supplements in sports, that many people use as a fixed daily basis around their strength training. Neutral in taste and simple in use. Want to know more? See our Creatine Monohydrate.
  • Pre-workout. For some, a set time before training, with caffeine (about a cup of coffee per serving). Handy if you like to have a routine around your session; just keep caffeine in mind if you train later in the day. Check out our Pre-Workout.
  • BCAA. Branched-chain amino acids that you also get through high-protein foods and whey. For those who already have their protein sorted, they are often not necessary; they can be practical as a tasty drink option around training. Check out our BCAA 2:1:1.

Do you see the pattern? Every time “can be handy”, never “must”. Supplements fit within a complete nutrition and training plan; they are the cherry on top, not the cake. Always follow the directions for use on the label for the correct dosage.

Don't know where to start? Our Supplement selector asks you a few short questions and gives you an honest, no-obligation proposal. And if you want more background, read Which supplements do you really need as a beginner? in our Knowledge Center. Prefer everything clearly together? Then check out our bundles or browse all our products.

Step-by-step plans per goal

Enough theory — here is how you approach it concretely. For each goal, you follow the same backbone, each with a slight twist. Always start at step 1.

I want to lose weight

  1. Calculate your calorie needs with our free calculator.
  2. Choose your goal: weight loss (calorie deficit).
  3. Set your calories: approximately 300 to 600 kcal below your maintenance — moderate, not extreme.
  4. Determine your protein: keep this high (guideline around 1.6 to 2.2 g per kg) to maintain muscle mass and support satiety.
  5. Plan training and exercise: strength training to maintain muscle, plus daily steps.
  6. Follow up 2 to 4 weeks later: weigh yourself regularly under similar conditions and look at the average over the weeks, not a single day.
  7. Adjust based on results: is your weight not dropping on average? Eat a little less or move a bit more. Is it going too fast or do you feel unwell? Eat a little more.

I want to cut

  1. Calculate your calorie needs with the calculator.
  2. Choose your goal: cutting — fat loss with maximum muscle maintenance.
  3. Set your calories: a moderate deficit (on the cautious side, e.g., 300 to 500 kcal below maintenance) to spare muscle.
  4. Determine your protein: keep it high — this is extra important during a cut.
  5. Plan training: keep strength training and try to maintain your weights and reps; add some cardio or steps to taste.
  6. Follow up 2 to 4 weeks later: don't just look at the scale, but also at your performance in the gym and how you look.
  7. Adjust: are your performances dropping sharply or is your fat loss stagnating for a long time? Re-evaluate your deficit and your protein before you drop any further.

I want to bulk

  1. Calculate your calorie needs with the calculator.
  2. Choose your goal: bulking — muscle and strength building.
  3. Set your calories: a modest surplus (lean bulk, e.g., 200 to 400 kcal above maintenance). Faster is not better.
  4. Determine your protein: sufficient as a building block; supplement with carbohydrates for your training energy.
  5. Plan training: strength training with progressive overload — doing more over time.
  6. Follow up 2 to 4 weeks later: a gradual increase is the goal; if your weight shoots up too fast, there is probably a lot of fat in it.
  7. Adjust: nothing is being added, eat a little more. Is it going too fast, temper your surplus a bit.

I want to maintain my weight

  1. Calculate your calorie needs with the calculator.
  2. Choose your goal: maintenance — stable weight.
  3. Set your calories: approximately at your maintenance.
  4. Determine your protein: keep it at a solid level; it supports your muscle mass and satiety during maintenance too.
  5. Plan training: keep training to get stronger and maintain your routine.
  6. Follow up 2 to 4 weeks later: if your weight stays about the same, you are on track.
  7. Adjust: if your weight still gradually creeps up or down, slightly correct your calories until it is stable again.

Examples from practice

Let's get concrete, with four recognizable situations. The numbers are illustrative — you get your own numbers from the calculator.

  • Someone wants to lose 5 kg. They calculate their maintenance, subtract about 400 kcal, set their protein high, and combine strength training with daily walks. They aim for a gradual loss over several months instead of “5 kg in a month”, and track their average weight per week. Calm pace, sustainable plan.
  • Someone wants to lean bulk. He eats about 250 to 300 kcal above maintenance, keeps his protein on track, and focuses on progressive overload in the gym. He accepts that gaining weight slowly, because that way the majority remains muscle and he keeps fat gain limited.
  • Someone stays at maintenance after a cut. After months of dieting, she slowly dials her calories up to maintenance instead of immediately letting loose. Her weight stabilizes, her energy returns, and she gives herself time to let her new habits settle before choosing a next goal.
  • Someone works long shifts. Irregular hours make fixed meals difficult. He keeps it simple with a few recurring, easy-to-prepare meals, takes high-protein snacks with him, and occasionally uses a shake when a full meal really isn't possible. Not perfect, but consistent — and consistency wins.

Common mistakes

Most people get stuck in the same places. If you recognize a few, you immediately know where your gains are.

  • Eating too little. Going extremely low feels powerful, but leads to hunger, lethargy, muscle loss, and giving up. A moderate deficit works better and longer.
  • Wanting to lose weight too fast. Patience is not a cliché here but a strategy. Slow and steady keeps you going; crash and yo-yo do not.
  • Focusing only on supplements. Powders are the cherry, not the cake. Without a solid foundation in nutrition and training, they do little.
  • Too little protein. Especially in a deficit, this is the macro you don't want to neglect; it protects your muscle mass and keeps you satiated.
  • Not doing strength training. Without a stimulus for your muscles, you lose muscle more often when losing weight, and build less when bulking.
  • “Ruining” everything every weekend. Five good days and two days of going way over the line can neutralize your whole week. You don't have to be perfect on the weekend, but a little conscious.
  • Changing plans too often. Trying a new diet every two weeks gives no plan the time to work. Choose an approach and give it a few weeks.
  • Blindly copying what influencers do. What works for someone with a different body, different genes, different training experience (and sometimes different tools) may not work for you. Learn the principle, don't copy the schedule.
  • Relying too much on the scale. Your weight fluctuates daily due to water, food, and digestion. Look at the average over weeks, and also use the mirror, photos, your clothes, and your performance as a measure.

Frequently asked questions

Do I need to count calories to lose weight?

No, counting is not mandatory. Losing weight requires a calorie deficit, and you can also achieve that through conscious choices, smaller portions, and plenty of whole foods. Still, counting for a few weeks is educational for many people: it shows how much you really eat. See it as a temporary tool to create awareness, not as a permanent obligation.

How many calories do I need to eat to lose weight?

That depends on your maintenance calories. A commonly used starting point is 300 to 600 kcal below your maintenance. First calculate your personal needs with our calculator and use that number as a starting point that you adjust after one to two weeks.

What is the difference between cutting and losing weight?

Both happen in a calorie deficit. “Losing weight” is often simply about a lower weight; “cutting” emphasizes losing as much fat as possible while retaining as much muscle mass as possible, with sufficient protein and strength training. Cutting is especially relevant if you already train or have built muscle mass.

How much protein do I need?

A commonly used guideline for active people is around 1.6 to 2.2 grams per kilogram of body weight per day. See that as a general starting point, not a strict law — your individual needs may differ. In a calorie deficit, you often prefer to be on the higher side to spare muscle mass.

Can I build muscle mass and lose fat at the same time?

For some people, that is possible to a certain extent, especially beginners, people returning after a break, or those who have a bit more body fat. For seasoned athletes, it usually goes slower and you more often consciously choose a building or a cutting phase. Sufficient protein and strength training are the common thread in both cases.

Is bulking necessary to build muscle?

Not necessarily. A slight surplus supports building, but beginners and people with a bit more body fat can also make progress on maintenance or in a slight deficit. As you become more advanced, a controlled bulk often becomes more convenient to keep growing.

What is better: clean bulk or dirty bulk?

For most people, a clean (lean) bulk: a modest, controlled surplus where you gain weight more slowly but “cleaner” and put on less fat. A dirty bulk makes you gain weight faster, but with more fat that has to come off later. Faster is therefore not automatically better.

How long should a cut last?

As long as necessary to achieve your goal, but without staying endlessly in a deficit. Many people work in blocks of several weeks to a few months, with a maintenance period in between to refuel. Listen to your performance and your energy; if they keep dropping for too long, a maintenance break is often wise.

How do I know if my calories are correct?

Not through one calculation, but by tracking. Eat according to your set calories for one to two weeks and see what your average weight does. Is it moving in the direction you want at a reasonable pace? Then your calories are correct. If not, you adjust with small steps. The calculator gives the estimate; the scale over the weeks gives the confirmation.

Are supplements necessary?

No, supplements are not necessary to achieve your goal — your nutrition, training, and sleep do the work. They can be practical to make your plan easier, such as whey to meet your protein more easily. In doubt? Use our Supplement selector for an honest, no-obligation proposal.

What should I eat before or after training?

For most people, your total daily nutrition and your daily protein intake count more than the exact timing. A meal or snack with some protein and carbohydrates in the hours around your training is a great practical choice, but you don't need to panic about an “anabolic window”. Choose something that suits you well and fits your day.

Why am I not losing weight while eating little?

Usually, the deficit in practice is smaller than thought. Portions are unconsciously underestimated, snacks and drinks count, and the weekend can neutralize a strict week. Also, your weight fluctuates daily due to water. Measure more accurately for a few weeks, look at your average over time, and only then adjust. Often it turns out that “eating little” is just a bit more than it felt.

Finally

Losing weight, cutting, bulking, or maintenance: they are all variants on one theme — aligning your energy balance with your goal, keeping your protein on track, strength training, sleeping well, and sticking with it for months. There is no magic diet and no miracle powder. There is, however, a clear process: calculate your starting point, choose your goal, set your calories and protein, train, follow up, and adjust. Do that consistently and the results will follow naturally.

Ready to start? Calculate your calorie needs, then optionally use our Supplement selector, and dive into our Knowledge Center for more depth. If you want to practically supplement your routine, feel free to browse all our products or our bundles — at your own pace, without pressure.

Dietary supplements are not a replacement for a varied, balanced diet and a healthy lifestyle. This article is general information and not medical or individual nutritional advice. If you have health complaints, are pregnant, or use medication, consult a doctor or registered dietitian first. Always follow the directions for use on the label for supplements.